Grading or screening materials



R. S. JACOBSEN.

GRADING OR SCREENING MATERIALS.

APPLICATION FILED JUNE 13, 1917.

L wsfigfio Patented Jan.1,1922.

g l r iifii RICHARD S. JACOBSE'N, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAOOBSEN SCHRAEDER,

INCORPORATED, OF CHICAGO ILLINOIS, A CORPORATION OF ILLINOIS. I

GRADING 0R SCREENING MATERIALS.

Specification of Letters Patent.

Patented Jan. 1%, 1922.

Application filed June 13, 1917. Serial No. 174,453.

Materials, of which the following is a specification.

This invention relates to a novel and useful method of grading or screening coal, stone and other granular materials.

It is especially applicable to coal mining plants, in connection with or as a part of the tipple for preparing and eiiiciently gradin or screening the coal.

fine of the objects of my improved method is the provision and arrangement of means for grading or screening materials whereby the largest pieces of the material are first extracted from the mass and then the next larger in size and so on until all of the material has been separated or graded and deposited where desired.

The advantages of my herein described method are several and far-reaching. In one instance, and particularly in the handling of fragile material as coal, it will be observed that my method is opposite to that now generally employed by the present coal tipple arrangements wherein the practice is to remove or extract by screening, the smallest sizes first, and finally to discharge the lump at the ends of such screensQ It will be observed that in this present practice, the larger sizes of coal are carried over the greater portion of the screening surface and that particularly the lump traverses the entire Screens before final disposition. Among the objectionable results of this practice are the undesirable further crushing of the smaller materials under the rolling or screening action of the larger, the disadvantage of picking the mixed coal to extract the refuse, such as rock or slate, and further, the reduction of the effective screening surface by the unnecessary transportation of the larger sizes toward the farther end of the screen.

The present invention contemplates also and provides anovel arrangement of conveying screens tending toward a variation of tipple design afiiording' very efficient arrangements meeting a variety of conditions and requirementsso often desired in the grading of coal.

With these and other objects in view, this invention resides in the method herein described, and in the combination, arrangement, and relative positions of the parts and members set forth in the following specification, and particularly pointed out and fallin within the scope of the appended claims.

11 the diagrammatic drawings, Figure l is a sectional elevation of a system of screens and conveyors arranged in accordance with my novel method.

Figure 2 is a plan view and Figure 3 is a sectional elevation taken on line 33 of Figure 1, showing the horizontal cross con veyor and pivoted chute for delivering the material into a railroad car.

Figure 4L is a preferred form or modification of the arrangement shown in Figure 3. In this case the chute is ircciprocated by a similar mechanism mounted on the same shaft for the purpose of counteracting the reaction of the coacting horizontal conveyor and for afi'ording a steeper angle for the chute by the opposite or retarding action induced by the oppositely mounted mechanism.

I have preferred to illustrate my inven tion as practiced in connection with horizontal screens and conveyors for grading coal, and as shown on the attached drawing, 10, indicates a delivery chute into which the coal is fed preferably with a regular predetermined rate by means of any suitable feeding device. In this particular instance. the screening or grading apparatus consists of a pair of'substantially horizontal. troughs, 11 and 12, which are supported-respectively on rollers, 11 and 12 and whch are moved by means of a suitable mechanism with a peculiar reciprocatory motion-so that the material supported orcarried thereon will be conveyed in a forward direction. A mechanism of this character is shown in my pending application for Letters Patent filed September 11', 1916,' Serial No. 119554.

Suitable connecting rods, 13, (partly shown) are used to connect the mechanism with the trough.

The mixed mass of coal is lnitially discharged upon the upper'deck of screen 11 which comprises the short sections of plate 11 and 11, side plates 11 and a plurality of parallel bars 11 spacedsufiiciently apart to pass all smaller sizes of coal and retain the predetermined size of lump, which it I in order toladvance the materials thereon.

-ve'rsely arranged conveyers, 'so that' in time the. coarser materials which-stayj on each screenfare discharged from the end thereof, and'are then finally discharged fromvthe end will be observed, will be deposited onto the horizontal cross conveyor 14:, and down the .pivotally mounted inclined chute, 15, into bars 11 which in this case are spaced shorter distances apart than the bars 11 thus retaining the next larger or egg size and conveying same over the end plate -11 onto the horizontal cross conveyor 17,which inturn discharges same down chute 18 into the car 19. The mixed coal which has passed between bars 11 falls partly onto the solid plate 12 and partly onto the per- 'torated plate portions 12; here the walls furtherv rescreened, the next larger or nut coal being conveyed, over the solid plate portion 12 to be passed; down a suitable chute 20 into car 21. The under-size or slack which has passed through the round perforations of 12 falls onto the lower deck solid plate l2 and is conveyed into chute 22 to the car 28. The supporting rollers 24 and driving mechanisms 25 for the cross conveyors are similar to those above [described for the screens. The plates ll 'and 11 are: deflected downwardly. as at 26 to slightly lift the coal as it passes same to prevent clogging of screen gby, coal which might otherwise engage the sharp edge oi? the plate. v It is obvious that in both cases wherel have provided bars, plates withlarge perforations could be used; I prefer to show bars. It is also apparent that the cross conveyorsprovide opportunity for picking. the screened coal to remove refuse as rock and slate, and that such cross conveyors could,

if desired, be used in connection with the,

other "sizes. I

From the foregoing it will be seen that the screening apparatus comprises-a plurality of horizontally disposed and endwise reciprocating screens,'the reciprocation of .which. isnecessary in order-to advance the 7 materials thereon, inasmuch as it is desired to keepthe height of the apparatus as low as possible, instead of tilting the screens to ad- Vance the materials-thereon by gravity. The transversely arranged conveyors 14 and 17 receive the materials from; the discharge ends ot the reclprocating screens, and are also hori-zontally disposed, so that the recip-- rocationoftheseconveyers is also necessary screens, inthe manner explained, and are also advanced, intermittently on the trans materials.

screening apparatus for more than a short period of time, thus minimizing the break- 7 age of the coal, and reducing'the" amount of slag or,.fi ne stuii. Theretore, as ex- }Jlained, the coarse materials are eliminated first, so that the materials are graded from coarse to fine, and the reciprocation of the agparatus, which is necessary to. advance the materials thereon, serves also to agltate the coal or other materials to cause the different sizes to drop through the perforations or openings or Ineshesot' the screens. Even the chutes 15 and 18 are adapted tooperate horizontally, as they are provided with .znechanism,as shown, to, produce the reciprocation necessary to advance; the materials thereon, and thus the, feeding of the materials by gravity is practically entirely eliminated from the operation of the ap; paratus, and at the same time the materials are graded from 'coarseto fine, sov that' the coarser materials are almost immediately allowedto escape from the apparatus, thus insuring the proper sizing or-grading o'filtihe coal in a manner that involves practically,

a minimum of, breakageq 5 With the foregoing process or method of screening and grading. materials, it -will be,

seen thatthe coarsest materialsare termed into a heap in thecar, 16, the nexusize into aheap in the car 19, the next. size'into a heap. in the car 21, and the finest size into aheap n the car 23, so that, the finest size formsthc third heap in' the series of tour heapsthus formedby the screening and grading oithe The screen l'lFior-zteinls under the screen D, and thescreen 12. extends under the screen 11 so that the, latter mustextend under the. endwise reciprocating anditra iisversely arranged conveyer 1d,.wh1le the screen 12 extends underth endw1se rec p rocating and transverselyarranged conveyer 17, thus requiringa horizontal and lateral discharge of the first two sizes .from ,the longitudinally disposed screening apparatus.

On the other hand; there isnothing below? the discharge end of theconveyer 12 ,.and nothing below the discharge end the'conveyer section 12 so far. as screens or other convevers 'are concerncd,yand hence; anyordi nary or suitable spouts: 20 and 22 can be used to. receive the materials-at these points, as the discharge canbe directlydownward or more or less in a downwarddirection, it soj d sired, whereasthe materials discharged into the conveyors 14 and'l'? would have to pass downwardly through other screens, should a direct downwarddischarge be attempted, and hence the desirability of the direct lateral discharge. afiorded by these two endwise reciprocating and transversely arranged conveyers.

Having thus described my invention, what I claim as new is:

1. A .screening apparatus comprising a horizontally disposed screen, means whereby said screen reciprocates longitudinally to a d Vance the materialsthereon from one end thereof to the other, so that the coarser portlons of the materials stay on the screen and are discharged from one end thereof, while the finer materials fall through the screen, a transversely arranged conveyer to receive the coarser materials, and mechanism to reciprocate said conveyer endwise to advance th materials thereon and finally discharge the same from the end thereof.

2. A structure as specified in claim 1, in combination with a second reciprocating screen arranged below said first screen, a second transverse conveyer arranged to receive the discharge from the end of the second screen, and mechanism for reciprocating the second conveyer endwise.

3. A structure as specified in claim 1, in combination with screening apparatus arranged to receive the materials which fall through said reciprocating screen.

4:. The combination of a plurality of endwise reciprocating screens so arranged that the finer materials pass through one screen while the coarser materials remain thereon and are discharged from the end thereof onto the next screen, means to receive the materials from the ends of said screens, and means to receive th finer materials which fall through the last screen, said screens being disposed horizontally, so that the reciprocatory movement of the screens is necessary for the advancement of the materials thereon, and said means for receiving the materials from the ends of said screens comprising one or more transversely arranged and endwise reciprocating conveyors which are also horizontally disposed.

5. A screening apparatus as specified in claim 1, said transversely arranged conveyer being provided with a' tilting chute for discharging the materials therefrom, the screen and the conveyer being reciprocated independently of each other.

6. In screening apparatus, the combination of screening instrumentalities comprising one or more endwise reciprocating and horizontally disposed screens, said apparatus having openings therein to eliminate the coarser materials first, so that the materials are graded from coarse to fine; operating mechanism to produce the longitudinal reciprocation of said apparatus to intermittently advance the materials thereon. as well as to agitate the materials, so that all oi the materials except those which remain on.

the screen fall through and are received by the next screen, and means for separately and laterally discharging the sized mate rials from said screening instrum entalities, each screen being substantially horizontal, and said laterally discharging means being also substantially horizontal, together with mechanism for operating said discharging means independently of the operation of said screening instrumentalities.

7. In a screening apparatus, the combination of a horizontally disposed and longitudinally reciprocating structure comprising screening instrumentalities for eliminating the coarser materials first, so that the materials are graded from coarse to fine, means for separately discharging the sized materials, from the screening instrumentalities, and mechanism for producing the longitudinal reciprocation of said apparatus.

8. In a screening apparatus, the combination of a screen, a transversely arranged and endwise reciprocating conveyer to receive the coarse materials from the end of the screen, and a screen extending under said conveyer to receive the materials which pass through the perforations of said first mentioned screen.

9. In a screening apparatus, the combination of a screen, a transversely arranged and endwise reciprocating conveyer to receive the coarse materials from the end of said screen, and a longitudinally arranged and endwise reciprocating conveyer extending under said first mentioned conveyer to receive the materials which pass through the perforations of said screen.

10. A structure as specified in claim 8, said screens having endwise reciprocation to intermittently advance the materials thereon.

11. The combination of a screen, an endwise reciprocating and transversely arranged conveyer to receive the coarse materials from the end of said screen, and means extending under said conveyer to receive the materials which pass through the perforationsof said screen.

12. I11 screening apparatus, the combination of a series of longitudinally disposed and endwise reciprocating screens disposed in different horizontal planes, so that the materials which pass through the perforations ofone screen are received by the next screen, mechanism for reciprocating said screens to intermittently advance the materials thereon, so that the advancement of the materials on each screen is dependent entirely upon the reciprocation thereof, and.

means for receiving and grading the materials helow the screens.

13. In screening apparatus, the combination of means for forming the coarse materials in a heap, means for forming some of the finer materials in another heap, and

means for accumulating the finest materials in a heap between said other heaps.

14- In screening apparatus, the combina tion of means for forming the'coarsestinaterials into a heap, means for forming the finest materials into another heap,--n1eans for forming another size of the materials into a heap between said other heaps, and means for forming-still another size of the :materials into a heap beyond the said finest heap.-

'15. The process of grading materials,

which consists in forming the coarsest materials into a heap, forming the next size into another heap, then forming the finest materials into a third heap, and finally accumulating an intermediate size into a fourth heap.

16. In screening apparatus, the combination of a plurality of transversely arranged and endWise reciprocating conveyers, so that the materials are successively screened and discharged laterally from the apparatus,

the coarsest size forms thefirst heap, the i next size the second heap, the next size; the

fourth heap, and the finest sizethe third heap in the series o't four heaps thus formed by the screening and'grading'of the materials.

In Witness whereof, I have hereunto subscribed my name this ninth day of June,

- RIQHARD. S.1JAC4OBSEN, 

